custom related list in Zoho CRM

gistfile1.txt

string getProductsFromPurchaseorder(string purchase_order_id)
{
	purchase_order_record = zoho.crm.getRecordById("PurchaseOrders",input.purchase_order_id.toLong());
	line_items = purchase_order_record.get("product").toJSONList();
	xml_for_related_list = "<record>";
	idx = 0;
	for each line_item in line_items
	{
		line_item_map=line_item.toMap();
		xml_for_related_list=((xml_for_related_list + ("<row no='" + idx + "'><FL val='product name'>" + line_item_map.get("Product Name")) + "</FL><FL val='quantity'>") + line_item_map.get("Quantity")) + "</FL></row>";
		idx=(idx  +  1);
	}
	return xml_for_related_list + "</record>";
}